hadoop 启动时namenode和datanode可以启动,使用jps命令也可以看到进程,但是在浏览器中输入master:50070却没有显示datanode 查看datanode的log日志: -- ::, INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/. Already tried  , sleepTime= SECONDS) -- ::, INFO org.apache.hadoop.ipc.…

昨晚突然之间mr跑步起来了 jps查看 进程都在的,但是在reduce任务跑了85%的时候会抛异常 异常情况如下: 2016-09-21 21:32:28,538 INFO [org.apache.hadoop.mapreduce.Job] - map 100% reduce 84% 2016-09-21 21:32:30,623 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce 2016-09-21 21:32:3…

在master(即:host2)中执行 hadoop jar hadoop-test-1.1.2.jar DFSCIOTest -write -nrFiles 12 -fileSize 10240 -resFile test 最后fail,为啥,看了一下日志 org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /benchmarks/TestDFSIO/io_data/test_io_0 could only be r…

hive> select product_id, track_time from trackinfo limit 5; Total MapReduce jobs = 1 Launching Job 1 out of 1 Number of reduce tasks is set to 0 since there's no reduce operator org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.io.IOEx…

1:初学hadoop遇到各种错误,这里贴一下,方便以后脑补吧,报错如下: 主要是在window环境下面搞hadoop,而hadoop部署在linux操作系统上面:出现这个错误是权限的问题,操作hadoop是虚拟机的主机用户不是window的主机用户Administrator,所以出现下面的错误,解决办法如下所示(或者修改文件的权限,即所有者都可以进行可读,可写,可执行): log4j:WARN No appenders could be found for logger (org.apache.…

ERROR: Can't get master address from ZooKeeper; znode data == null   一定注意这只是问题的第一层表象,真的问题是: File /hbase/.tmp/hbase.version could only be replicated to 0 nodes instead of minReplica 网上很多都是叫用两种方式解决 stop/start  重启hbase 格式化 hdfs namenode -format,不能随随便便就格…

1 详细异常 Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException): Permission denied: user=hdfs, access=WRITE, inode="/hbase":root:supergroup:drwxr-xr-x at org.apache.hadoop.hdfs.server.namenode.DefaultAu…

Hive执行count函数失败 1.现象: 0: jdbc:hive2://192.168.137.12:10000> select count(*) from emp; INFO : Number of reduce tasks determined at compile time: 1 INFO : In order to change the average load for a reducer (in bytes): INFO : set hive.exec.reducers.bytes…

今天使用JDBC来操作Hive时,首先启动了hive远程服务模式:hiveserver2 &(表示后台运行),然后到eclipse中运行程序时出现错误: java.sql.SQLException: Could not open client transport with JDBC Uri: jdbc:hive2://192.168.182.11:10000/default: Failed to open new session: java.lang.RuntimeException: org.…

用windows连接hadoop集群执行mapreduce任务的时候出现以下错误: org.apache.hadoop.security.AccessControlException:Permission denied: user=Administrator, access=WRITE,inode="/output":hadoop:supergroup:drwxr-xr-x Causedby:org.apache.hadoop.ipc.RemoteException(org.apach…